EP3944997A1 - Vehicle brake system and agricultural tractor - Google Patents

Abstract

The invention relates to a vehicle brake system in which a first valve device (60) is provided in the first brake circuit (30), the first valve device (60) being between a first configuration in which a flow connection between the pump (40) and the first wheel cylinder (32 ) is established and movable to a second configuration in which fluid communication between the pump (40) and the first wheel cylinder (32) is prevented and the first valve means (60) is operable with the first actuating means (50) such that the first valve means (60) is movable into the first configuration. The invention further relates to an agricultural towing vehicle, comprising such a vehicle brake system (28).

Description

The invention relates to a vehicle brake system according to the preamble of independent claim 1 and an agricultural towing vehicle according to the preamble of independent claim 13.

Known vehicle brake systems in agricultural towing vehicles include valve arrangements for braking, in particular with a first and/or second valve device or valves, which are arranged in particular in a cab of the towing vehicle. Due to this arrangement of the valve arrangements, the vehicle brake system has a complex routing of the lines and connections, i.e. the hydraulic supply and the wheel cylinders for braking a wheel can be arranged on a chassis and a large part of the valve arrangement in the cabin. Disadvantages of the known valve arrangement are therefore that they require a large installation space in the cabin, in particular on the brake pedal, and transmit hydraulic noise into the cabin. The problem on which the invention is based is thus seen as providing a vehicle brake system and an agricultural towing vehicle that optimize known vehicle brake systems and agricultural towing vehicles.

Based on this prior art, it is therefore an object of the present invention to propose a vehicle brake system and an agricultural towing vehicle which largely avoids the disadvantages known from the prior art, in particular to propose a vehicle brake system and an agricultural towing vehicle that are structurally simpler in design, for example are independent of temperature and/or maintenance-free, and/or require less installation space and/or reduce and/or avoid noise.

This object is achieved by a vehicle brake system having the features of claim 1 and an agricultural towing vehicle having the features of claim 13.

The dependent claims relate to particularly advantageous embodiments of the invention.

According to the invention, a vehicle brake system is proposed. The vehicle brake system includes a first master cylinder with a first master cylinder connection and a first actuating device with a first actuating connection. The first master cylinder connection is in flow connection with the first actuating connection, so these are in particular fluidly connected, and the first actuating device can be operated with the first master cylinder, preferably in such a way that it can be set and/or adjusted, particularly preferably actuated. The vehicle brake system also includes a first brake circuit, in particular a hydraulic brake circuit, which is provided, in particular arranged, between a pump and a first wheel cylinder, in particular a first hydraulic wheel cylinder. The pump can be operated in the first brake circuit, in particular also arranged to generate pressure and to move a fluid, in particular hydraulic fluid or hydraulic oil, within the first brake circuit. A first valve device is also provided, in particular arranged, in the first brake circuit. The first valve device is movable between a first configuration, i.e. in particular a first switching position, in which a flow connection is established between the pump and the first wheel cylinder, in particular by means of the first valve device, and a second configuration, in particular a second switching position which prevents a flow connection between the pump and the first wheel cylinder, in particular by means of the first valve device. In addition, the first valve device, in particular when the first actuating device is actuated with the first master cylinder, can be operated with the first actuating device or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device moves into the first configuration is movable or is being moved.

In other words, the first valve means is operable to establish fluid communication between the pump and the first wheel cylinder in a first configuration and to prevent fluid communication between the pump and the first wheel cylinder in a second configuration. In this case, the first valve device, in particular when the first actuating device is actuated with the first master cylinder, can be operated with the first actuating device or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device moves into the first configuration , In particular, is movable or is being moved from the second configuration into the first configuration.

The first master cylinder port and the first actuation port may be inlet and outlet for the fluid, respectively. In addition, the first master cylinder connection is in connection with the first activation connection, for example by means of a first activation line. The first main cylinder is therefore in fluid communication with the first actuating device or the first master cylinder is fluidly connected with the first actuating device. The first master cylinder may include a first master cylinder chamber and a first master cylinder piston disposed in the first master cylinder chamber. In this case, the first master cylinder port can be an inlet and outlet of the first master cylinder chamber of the first master cylinder. The first master cylinder piston can be brought into a retracted and extended position in the first master cylinder chamber by being pressurized. The first master cylinder, in particular the first master cylinder piston, can be actuated by an actuatable brake pedal, which can be arranged in particular in the cab of an agricultural towing vehicle. The first master cylinder can thus be actuated by the brake pedal which can be actuated by a user.

The vehicle brake system has a first brake circuit. The first wheel cylinder can be designed in such a way that one or more front and/or rear wheels, in particular driven wheels, can be braked or is braked with the first wheel cylinder. The first brake circuit, in particular the first wheel cylinder, can be coupled to the one or more rear wheels and/or to the one or more front wheels. The first brake circuit, in particular the first wheel cylinder, is designed to brake one or more front and/or rear wheels, in particular driven wheels, in response to an actuation of the brake pedal. In response to an application of the brake pedal, the first wheel cylinder may brake one or more front and/or rear wheels.

The first brake circuit can be physically provided in a hydraulic unit. The vehicle brake system can include the hydraulic unit. The hydraulic power pack may be configured to provide brake force distribution and/or traction control as part of a general towing vehicle Electronic Stability Program (ESP) as many of the same equipment components may already be provided by the vehicle braking system. The vehicle braking system may include brake anti-lock functionality to prevent wheel locking and skidding during hard braking or braking on low-friction surfaces. Although the hydraulic power pack can be used in vehicle braking systems with anti-lock braking and other functions, its application is not limited to such systems.

The first valve device can include a first brake valve, in particular a first brake valve, which can be arranged only in the first brake circuit or in the first and a second brake circuit. The first valve device, in particular the first brake valve, can assume the second configuration by default. The first valve device, in particular the first brake valve, and/or a second valve device, in particular a second brake valve, can be designed, for example, as an actuatable 4/2 or 5/2 or 4/3 or 5/3 directional valve with four or five ports. The first valve device, in particular the first brake valve, may include at least the first and second configurations, wherein the first configuration is a flow position and the second configuration is a blocking position.

The first actuating device can be designed to exert a switching force S on the first valve device. The first actuating device can actuate the first valve device with pressure. The first actuating device can, for example, comprise a first pressure valve, for example a piston, with the first actuating connection, wherein when the first actuating connection is subjected to a force, in particular pressure, from the first master cylinder, the first pressure valve moves the first valve device into the first configuration , In particular the first valve device with the first pressure valve can be moved or is being moved from the second configuration into the first configuration. The first actuating device and the first valve device can be designed and operable in such a way that, in particular when the first actuating device is actuated with the first master cylinder, the first actuating device actuates the first valve device with the switching force S, so that the first valve device can be moved into the first configuration or is moved. The first actuating device can also be designed as an integral part of the first valve device, in particular the first brake valve. The first actuating device can be designed as an actuator or else as a pilot valve (for example an electromagnetically controlled two-position valve that is open in the idle state) or as a first auxiliary cylinder. The first slave cylinder may include a first slave cylinder chamber and a first slave cylinder piston disposed in the first slave cylinder chamber. Here, the first actuation port may be an inlet and outlet of the first slave cylinder chamber of the first slave cylinder. In the first auxiliary cylinder chamber, the first auxiliary cylinder piston can be brought into a retracted and extended position in relation to the first auxiliary cylinder chamber by the application of pressure. The first slave cylinder, in particular the first slave cylinder piston, when the first Actuation connection is pressurized by the first master cylinder, move the first valve device into the first configuration, in particular move the first valve device from the second configuration into the first configuration.

The pump can be connected by means of a line to an accumulator charging device, in particular an accumulator charging valve, in particular in flow connection or in flow connection. The pump can also be designed as a first and second pump. The first brake circuit can connect the accumulator charging device to the first valve device, in particular the first brake valve, for example by means of a first brake line. In addition, the first brake circuit can connect the first valve device to the first wheel cylinder, in particular by means of a further first brake line. A first accumulator, preferably a first reservoir, particularly preferably a first pressure accumulator, can be arranged on or in the first brake line between the accumulator charging device and the first valve device. The first accumulator may include a bladder. The first reservoir or first reservoir can be flow-connected to the first brake line and/or downstream of the reservoir-charging device in the direction of flow. The pump can also be flow-connected to a fluid container and/or downstream of the fluid container in the direction of flow. The pump can be a pressure source, in particular a hydraulic pump. The first brake circuit can therefore be formed from the pump to the first wheel cylinder. Furthermore, the first brake circuit can include the first brake line, the further first brake line, the first valve device, the first wheel cylinder and the first actuating device.

What is essential for the invention is that the first valve device, in particular when the first actuating device is actuated with the first master cylinder, can be operated with the first actuating device, that the first valve device can be moved or is moved into the first configuration. This allows one The vehicle brake system can be implemented with a closed master-auxiliary system, here the first master cylinder and the first actuating device, in particular and/or a second master cylinder and/or with a second actuating device, with the first and/or second master cylinder advantageously being made much smaller and in particular direct connected to the brake pedal. Another advantage is that the vehicle brake system, in particular the fluid, has no limitations in terms of modulation behavior and response time at low ambient temperatures. The invention thus advantageously enables a highly dynamic and/or temperature-independent and/or maintenance-free vehicle brake system, in particular with minimal installation space around the brake pedal and/or reduced wiring complexity to the cabin (lower number of lines and smaller cross-section) and/or noise reduction. In addition, the vehicle brake system can be operated independently of the steering return and, in particular, is not connected to the steering return. Furthermore, a small continuous fluid flow and/or fluid pressure, preferably of the hydraulic fluid, particularly preferably of the hydraulic oil, can advantageously be realized by means of the vehicle brake system, as a result of which monitoring of the fluid can be dispensed with.

In an embodiment of the invention, the vehicle brake system includes a second brake circuit, in particular a second hydraulic brake circuit, which is provided, in particular arranged, between the pump and a second wheel cylinder, in particular a second hydraulic wheel cylinder. The pump is operable in the second brake circuit, in particular operable and arranged to generate pressure and move the fluid within the second brake circuit. The second wheel cylinder can be designed in such a way that one or more front and/or rear wheels, in particular driven wheels, can be braked or is braked with the second wheel cylinder. The second brake circuit, in particular the second wheel cylinder, can be coupled to the one or more rear wheels and/or to the one or more front wheels. The second brake circuit, in particular the second wheel cylinder, is designed to brake one or more front and/or rear wheels, in particular driven wheels, in response to actuation of the brake pedal. In response to an application of the brake pedal, the second wheel cylinder may brake one or more front and/or rear wheels. In particular, the first brake circuit, in particular the first wheel cylinder, can be coupled to the rear wheels and the second brake circuit, in particular the second wheel cylinder, can be coupled to the front wheels. However, the first brake circuit can also be coupled to one or more rear or front wheels and the second brake circuit to one or more additional rear or additional front wheels. The first and second brake circuits can in particular be divided into circuits for one or more rear wheels and/or one or more front wheels. The first and/or second brake circuit can be physically provided in the hydraulic unit. The second brake circuit, in particular the second wheel cylinder, can be designed to brake a front and/or rear wheel, in particular a front and/or rear driven wheel, in response to an actuation of the brake pedal. In response to an actuation of the brake pedal, the second wheel cylinder can therefore brake the front and/or rear wheel. If the pump is embodied as a first and second pump, the first brake circuit can be embodied, in particular arranged, between the first pump and the first wheel cylinder, and the second brake circuit can be embodied, in particular arranged, between the second pump and the second wheel cylinder . The first pump can thus be operable in the first brake circuit to generate pressure and move fluid, in particular hydraulic fluid, within the first brake circuit, and the second pump can be operable in the second brake circuit to generate pressure and move fluid within the second brake circuit . A first and second brake circuit advantageously allow different braking and/or a redundant vehicle brake system.

In an embodiment of the invention, the first valve device, in particular the first brake valve, is provided in the first and second brake circuit, in particular arranged. The first valve device is movable between a first configuration in which a flow connection is established between the pump and the first and second wheel cylinders, in particular by means of the first valve device, and a second configuration in which a flow connection is established between the pump and the first and second wheel cylinder is prevented, in particular is prevented by means of the first valve device. The first valve device, in particular when the first actuating device is actuated with the first master cylinder, can be operated with the first actuating device or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device can be moved into the first configuration or is moved. However, the first valve device can also be arranged only in the first brake circuit. Advantageously, the first and second brake circuits can thus be operated in a simple manner using only the first valve device.

In an embodiment of the invention, a second valve device is provided, in particular arranged, in the second brake circuit. The second valve device can be arranged in particular between the pump and the second wheel cylinder and the pump. The second valve device arranged in the second brake circuit can be moved between a third configuration, in which a flow connection is established between the pump and the second wheel cylinder, in particular by means of the second valve device, and a fourth configuration, in which a flow connection is established between the pump and the second wheel cylinder is prevented, in particular is prevented by means of the second valve device. The second valve device can include a second brake valve, in particular a second brake valve, which can be arranged in the second brake circuit. The second valve device, in particular the second brake valve, can assume the fourth configuration by default. The second valve device, in particular the second brake valve, can be designed, for example, as an actuatable 4/2 or 5/2 or 4/3 or 5/3 directional valve with four or five connections. The second valve device, in particular the second brake valve, can include at least the third and fourth configuration (switching position), the third configuration being a flow position and the fourth configuration being a blocking position. The second valve device can be designed exactly like the first valve device; in particular, the first and second valve devices can be identical. The second brake circuit can connect the accumulator charging device to the second valve device, in particular the second brake valve, for example by means of a second brake line. In addition, the second brake circuit can connect the second valve device to the second wheel cylinder, in particular by means of a further second brake line. A second accumulator, preferably a second container, particularly preferably a second pressure accumulator, can be arranged on or in the second brake line between the accumulator charging device and the second valve device. The second accumulator may include a bladder. The second reservoir or second reservoir can be flow-connected to the second brake line and/or downstream of the reservoir-charging device in the direction of flow. Furthermore, the second brake circuit can include the second brake line, the further second brake line, the second valve device, the second wheel cylinder and the second actuating device. As a result, a first and second brake circuit can advantageously be designed in a structurally simple manner. In addition, the vehicle brake system can be operated redundantly.

In an embodiment of the invention, the first and second valve devices, in particular when the first actuating device is actuated with the first master cylinder, can be operated with the first actuating device or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device is movable or is being moved into the first configuration and the second valve device into the third configuration, in particular is movable or is being moved from the fourth configuration into the third configuration. In this case, for example, the first actuating device to exercise a switching force S may be formed on the first and second valve device. The first actuating device and the first and second valve device can be designed and operable in such a way that, in particular when the first actuating device is actuated with the first master cylinder, the first actuating device actuates the first and second valve device with the switching force S, so that the first valve device in the first configuration and the second valve means are or can be moved to the third configuration. The first actuating device can also be designed as an integral part of the first and second valve device, in particular of the first and second brake valve. The first actuating device can pressurize the first and second valve devices. When the first actuation port is pressurized by the first master cylinder, the first pressure valve moves the first valve means to the first configuration and the second valve means to the third configuration. In particular, when the first actuating port is pressurized by the first master cylinder, the first slave cylinder, in particular the first slave cylinder piston, can move the first valve device to the first configuration and the second valve device to the third configuration. As a result, a first and second brake circuit can advantageously be operated in a simple manner. In addition, this allows the vehicle brake system to be designed in a structurally simpler manner and requires less installation space in the towing vehicle, in particular the cab. In addition, background noise is reduced or avoided.

In an embodiment of the invention, the vehicle brake system includes a second actuation device with a second actuation connection, the first master cylinder connection being in flow connection with the second actuation connection, ie in particular being flow-connected. The second actuating device can be operated, preferably adjusted and/or adjusted, particularly preferably actuated, with the first master cylinder. The first valve device can be operated with the first actuating device and the second valve device can be operated with the second actuating device or the like operable, preferably adjustable and/or adjustable, particularly preferably operable or operable in such a way, in particular when the first and second actuating devices are actuated with the first master cylinder, that the first valve device can be moved or moved into the first configuration and the second valve device into the third configuration will. The second actuating device can be designed to exert a switching force S on the second valve device. The second actuating device can actuate the second valve device with pressure. The second actuating device can comprise, for example, a second pressure valve, for example a piston, with the second actuating port, wherein when the second actuating port is pressurized by the first master cylinder, the second pressure valve moves the second valve device into the third configuration, in particular the second valve device with it the second pressure valve is movable or being moved from the fourth configuration to the third configuration. The second actuating device and the second valve device can be designed and operable in such a way that, in particular when the second actuating device is actuated with the first master cylinder, the second actuating device actuates the second valve device with the switching force S, so that the second valve device can be moved into the third configuration is or is being moved. The second actuating device can also be designed as an integral part of the second valve device, in particular the second brake valve. However, the second actuating device can also be in the form of a pilot valve (eg an electromagnetically controlled two-position valve which is open in the idle state), or a second auxiliary cylinder. The second slave cylinder may include a second slave cylinder chamber and a second slave cylinder piston disposed in the second slave cylinder chamber. Here, the second actuation port may be an inlet and outlet of the second slave cylinder chamber of the second slave cylinder. In the second auxiliary cylinder chamber, the second auxiliary cylinder piston can be brought into a retracted and extended position in relation to the second auxiliary cylinder chamber by the application of pressure. The second slave cylinder, in particular the second slave cylinder piston, if the second actuation port is pressurized by the first master cylinder, move the second valve means to the third configuration, in particular move the second valve means from the fourth configuration to the third configuration. However, the first master cylinder can also have a further first master cylinder connection. The additional first master cylinder port and the second actuation port can be inlet and outlet for the flowing fluid, respectively. The additional first master cylinder port can therefore, instead of the first master cylinder port, be connected to the second actuation port by means of the second actuation line. The first master cylinder can therefore be in flow connection with the second actuating device or the first master cylinder can be flow-connected with the second actuating device. In this exemplary embodiment, the first master cylinder port can be connected to the first actuation port and the further first master cylinder port can be connected to the second actuation port. In this way, the first and second brake circuits can advantageously be operated redundantly in a simple manner. In addition, this allows the vehicle brake system to be designed in a structurally simpler manner.

In an embodiment of the invention, the vehicle brake system comprises a second master cylinder with a second master cylinder connection and the second actuating device with a second actuating connection, the second master cylinder connection being in fluid communication with the second actuating connection and the second actuating device being operable with the second master cylinder, preferably adjustable and/or adjustable, particularly preferably operable. The first valve device, in particular when the first actuating device is actuated with the first master cylinder, can be operated with the first actuating device or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device, in particular by means of the first actuating device , is moveable or is moved to the first configuration, and/or the second Valve device is, in particular when the second actuating device is actuated with the second master cylinder, operable with the second actuating device or operable in such a way, preferably adjustable and/or adjustable, particularly preferably operable or operable in such a way that the second valve device, in particular by means of the second actuating device, in the third configuration is movable or being moved. In other words, the second valve device, in particular when the second actuating device is actuated with the second master cylinder, can be operated with the second actuating device such that the second valve device can be moved or is moved into the third configuration, in particular from the fourth configuration into the third configuration . In particular, the second actuating device and the second valve device can be designed and operable in such a way that the second actuating device actuates the second valve device with the switching force S, so that the second valve device can be moved or is moved into the third configuration. The second master cylinder port can be an inlet and an outlet for the fluid. The second master cylinder can therefore be in flow connection with the second actuating device or the second master cylinder can be flow-connected with the second actuating device, for example by means of a second actuating line. The second actuating device, in particular the second pressure valve, can move the second valve device into the third configuration when the second actuating connection is acted upon by the second master cylinder with a force, in particular pressure. If the second actuating device is designed as a second slave cylinder, the second slave cylinder, in particular the second slave cylinder piston, can move the second valve device into the third configuration when the second actuating connection is pressurized by the second master cylinder. The second master cylinder may include a second master cylinder chamber and a second master cylinder piston disposed in the second master cylinder chamber. The second master cylinder port can be an inlet and an outlet of the second master cylinder chamber being. The second master cylinder piston can be brought into a retracted and extended position relative to the second master cylinder chamber in the second master cylinder chamber by the application of pressure. The first and second master cylinders, in particular the first and second master cylinder pistons, can be actuated by the brake pedal, in particular the first and second master cylinders can be actuated by the user-actuable brake pedal. The first and second brake circuits, in particular the first and second wheel cylinders, are therefore designed to brake one or more front and/or rear wheels, in particular a front and/or rear driven wheel, in response to an actuation of the brake pedal. However, it can also be the case that the first master cylinder is actuated with the brake pedal and the second master cylinder, in particular the second master cylinder piston, is actuated with a further brake pedal; in particular, the second master cylinder can be actuated by the further brake pedal that can be actuated by a user. The second brake circuit, in particular the second wheel cylinder, can therefore be designed to brake one or more front and/or rear wheels in response to an actuation of the additional brake pedal. As a result, all of the above-mentioned advantages of the vehicle brake system according to the invention can be realized.

In an embodiment of the invention, the first actuating device has a first supply connection and/or the second actuating device has a second supply connection. In addition, the first and/or second supply connection can be flow-connected to the pump by means of a first supply line, ie either only the first supply connection is flow-connected to the pump by means of the first supply line, or the first and second supply connection are simultaneously connected to the pump by means of the first supply line flow connected. However, the first supply connection can also be flow-connected to the pump, in particular the first pump, and/or the second by means of a first supply line Supply connection by means of a second supply line to the pump, in particular the second pump, be flow-connected. The first and second supply connection can be inlet and outlet for the fluid. Specifically, the first supply port may be an inlet and outlet of the first slave cylinder chamber of the first slave cylinder and/or the second supply port may be an inlet and outlet of the second slave cylinder chamber of the second slave cylinder. The pump can be connected to the first and/or second actuating device by means of the first and/or second supply line, that is to say it can be flow-connected to the first and/or second actuating device. A first pressure relief valve can be arranged in the first supply line and/or a second pressure relief valve can be arranged in the second supply line, which valve(s) open if the pressure in the respective supply line exceeds a predetermined maximum pressure. A check valve can also be arranged in the first and/or second supply line between the first and/or the second supply connection and the respective assigned pressure relief valve, in particular a first check valve can be arranged in the first supply line and/or a second check valve can be arranged in the second supply line . In order to reduce the pressure in the first and/or second supply line, a first throttle or a throttle valve can be arranged between the pump and the respective overpressure valve in the first supply line and/or a second throttle or a throttle valve can be arranged in the second supply line. Advantageously, a small continuous fluid flow and/or fluid pressure of the fluid to the first and/or second actuating device can thereby be implemented. In addition, the size of a reservoir can be significantly reduced.

In an embodiment of the invention, the first main cylinder comprises a first reservoir connection and/or the second main cylinder comprises a second reservoir connection, and/or the first main cylinder is connected by means of the first Reservoir connection and / or the second master cylinder is flow-connected by means of the second reservoir connection with a reservoir. The first and/or second reservoir connection can be the inlet and outlet for the fluid. The reservoir can serve as a drain and to supply the first master cylinder and/or the second master cylinder. The first reservoir connection can be connected to the reservoir with a first reservoir line and/or the second reservoir connection can be connected to the reservoir with a second reservoir line. The first and/or second master cylinder can therefore be or be in flow connection with the reservoir. Advantageously, the reservoir only has the connection to the first and/or second master cylinder, ie it is an independent reservoir. In addition, the reservoir is independent of the steering return and is in particular not designed as part of the steering return. Advantageously, a small continuous fluid flow and/or fluid pressure of the fluid from the first and/or second actuating element to the first and/or second master cylinder can thereby be realized, whereby monitoring of the reservoir and access to the reservoir for refilling can be dispensed with. In addition, a closed reservoir, ie a connection to existing reservoirs, for example steering, can advantageously be dispensed with and the size of the reservoir can be significantly reduced.

In an embodiment of the invention, the first and/or the second valve device each have a first restoring element for restoring into the second and/or fourth configuration. In addition, the first and/or the second valve device can each have a second restoring element for restoring into the second and/or fourth configuration. The first and/or second restoring element on the first valve device can therefore move the first valve device from the first to the second configuration. Likewise, the further first and/or the further second restoring element on the second valve device can move the second valve device from the third to the fourth configuration. The first and/or second restoring element can, for example, be controlled mechanically or electromechanically or electromagnetically being. The first and/or second restoring element can be designed, for example, as a spring or as an electrical actuator with a magnetic coil. The second restoring element is advantageously an additional actuation to compensate for the flow and/or pressure of the fluid in the first and/or second valve device. Advantageously, the resetting of the first and/or second valve device can be controlled more precisely by means of the first and second resetting element. Advantageously, the fluid flow can be interrupted even with a slight actuation of the brake pedal and/or the further brake pedal, with each further movement building up pressure and actuating the first and/or second valve device.

The invention further relates to an agricultural towing vehicle comprising a vehicle brake system, in particular a vehicle brake system according to one of claims 1 to 12. The agricultural towing vehicle according to the invention has the advantages of the vehicle brake system according to the invention described above. In an embodiment of the invention, the agricultural towing vehicle comprises a cab and a chassis, with the cab being arranged on, in particular on, the chassis. In addition, in particular only the first and/or second master cylinder and the reservoir, and in particular the associated lines, are arranged in the cabin. All other components of the vehicle brake system can be arranged on, in particular in, the chassis.

The vehicle brake system according to the invention and/or the towing vehicle can include a control unit. The control unit and/or further control unit (ECU=electronic control unit or ECM=electronic control module) can be an electronic module and/or an embedded system. The control unit can include a memory module and/or a processor. The control unit can be connected to the first and/or second master cylinder, the first and/or second actuating device, in particular slave cylinder, the first and/or second valve device, one or more sensors and/or the memory and/or Processor and / or the hydraulic unit to be signal-connected, so be data-connected. The connection can be wired or wireless, i.e. wireless. The communication bus can be, for example, Isobus, CAN bus or the like. The control unit can be provided as part of the vehicle brake system or on the towing vehicle. In particular, two control units can also be provided, a first for the towing vehicle and a second for the vehicle brake system. In addition, the first and/or second master cylinder and/or the first and/or second actuating device, in particular the slave cylinder, and/or the first and/or second valve device and/or the one or more sensors can be adjusted and/or adjusted by means of the control unit being. The sensor or sensors can provide input information, typically related to relative wheel speeds, so that the control unit can regulate the operation of the hydraulic power unit.

Fig. 1

eine schematische Darstellung eines erfindungsgemässen landwirtschaftlichen Zugfahrzeugs, und

Fig. 2

eine schematische Darstellung eines ersten Ausführungsbeispiels der erfindungsgemässen Fahrzeugbremsanlage, und

Fig. 3

eine schematische Darstellung eines zweiten Ausführungsbeispiels der erfindungsgemässen Fahrzeugbremsanlage, und

Fig. 4

eine schematische Darstellung eines dritten Ausführungsbeispiels der erfindungsgemässen Fahrzeugbremsanlage, und

Fig. 5

eine schematische Darstellung eines vierten Ausführungsbeispiels der erfindungsgemässen Fahrzeugbremsanlage, und

Fig. 6

eine schematische Darstellung eines fünften Ausführungsbeispiels der erfindungsgemässen Fahrzeugbremsanlage, und

Fig. 7

eine schematische Darstellung eines sechsten Ausführungsbeispiels der erfindungsgemässen Fahrzeugbremsanlage, und

Fig. 8

eine schematische Darstellung einer Anordnung einer erfindungsgemässen Fahrzeugbremsanlage in einem erfindungsgemässen Zugfahrzeug.

Fig. 9

eine schematische Darstellung einer Anordnung einer erfindungsgemässen Fahrzeugbremsanlage in einem erfindungsgemässen Zugfahrzeug.

In the following, the invention and further advantages and advantageous developments and refinements of the invention are explained in more detail both in terms of apparatus and in terms of process technology using exemplary embodiments and with reference to the drawing. Components that match or are comparable in terms of their function are identified with the same reference symbols. In the schematic drawings show:

1

a schematic representation of an inventive agricultural tractor, and

2

a schematic representation of a first exemplary embodiment of the vehicle brake system according to the invention, and

3

a schematic representation of a second exemplary embodiment of the vehicle brake system according to the invention, and

4

a schematic representation of a third exemplary embodiment of the vehicle brake system according to the invention, and

figure 5

a schematic representation of a fourth exemplary embodiment of the vehicle brake system according to the invention, and

6

a schematic representation of a fifth exemplary embodiment of the vehicle brake system according to the invention, and

7

a schematic representation of a sixth exemplary embodiment of the vehicle brake system according to the invention, and

8

a schematic representation of an arrangement of a vehicle brake system according to the invention in a towing vehicle according to the invention.

9

a schematic representation of an arrangement of a vehicle brake system according to the invention in a towing vehicle according to the invention.

figure 1 shows a schematic side view of an agricultural towing vehicle 10 according to the invention, in particular in the form of a farm tractor or tractor. The basic structure of an agricultural towing vehicle 10 is assumed to be known to those skilled in the art.

The towing vehicle 10 has two or more means of engaging with the ground, in particular in the form of wheels 14, 16, which engage with a subsurface for the transmission of driving forces and/or by which the towing vehicle 10 is supported on the subsurface 18. The ground engaging means may be mounted or suspended on a front axle and a rear axle. In particular, the ground engaging means are front wheels 14 located on the front axle can, and/or rear wheels 16, which can be arranged on the rear axle. The towing vehicle 10 can also have a chassis, the chassis being supported in particular by the ground-engaging means suspended from the front axle and the rear axle.

In addition, the towing vehicle 10 has a drive 22 that is indicated, for example a motor, which can be in the form of an internal combustion engine. In addition, the towing vehicle 10 can include a transmission device 24, in particular a transmission. The ground engagement means can be driven or are driven by the drive 22, in particular by the drive 22 which interacts with the transmission device 24. In this case, in particular, an output torque of the transmission device 24 can be transmitted to the ground engagement means via a drive train. The towing vehicle 10 has a cab 20 in which an operator's workstation 26 is arranged. In addition, the towing vehicle 10 includes a vehicle brake system 28 according to the invention.

figure 2 shows a schematic representation of a first exemplary embodiment of the vehicle brake system 28 according to the invention figure 2 The vehicle brake system 28 shown is a detailed schematic representation of the figure 1 shown vehicle brake system 28. In the following, therefore, only in figure 1 details not shown included. The vehicle brake system 28 can, as in figure 1 shown, be installed in an agricultural towing vehicle 10.

The vehicle brake system 28 has a first brake circuit 30, in particular a first hydraulic brake circuit. The first brake circuit 30 is provided between a pump 40 and a first wheel cylinder 32, in particular a first hydraulic wheel cylinder. The pump 40 can be operated in the first brake circuit 30 in order to generate pressure and to move a fluid, preferably hydraulic fluid, particularly preferably hydraulic oil, within the first brake circuit 30 . The first wheel cylinder 32 can be designed such that one or more front and / or rear Wheels 14, 16 can be braked with the first wheel cylinder 32 or is braked. In figure 2 the first brake circuit 30 is coupled to the one or more rear wheels 16, in particular by means of the first wheel cylinder 32. The first brake circuit 30, in particular the first wheel cylinder 32, can also be coupled to only one or more front wheels 14.

As in 2 shown, the vehicle brake system 28 comprises a first master cylinder 34 with a first master cylinder port 36 and a first actuating device 50 with a first actuating port 52. The first master cylinder port 36 and the first actuating port 52 are respectively inlet and outlet for the flowing fluid. The vehicle brake system 28 includes a first actuation line 38 connecting the first master cylinder port 36 and the first actuation port 52 . The first master cylinder 34 is thus in fluid connection or fluidly connected to the first actuating device 50 . In addition, the first actuating device 50 can be operated with the first master cylinder 34 or is operated with it, preferably adjustable and/or adjustable, particularly preferably operable. The first master cylinder 34 can exert a force on the first actuating device 50, for example by the first master cylinder 34 being actuated with a brake pedal 54, in particular by a flow and/or a pressure of the fluid being exerted from the first master cylinder 34 to the first actuating device 50.

Furthermore, a first valve device 60 is provided, in particular arranged, in first brake circuit 30 . First valve device 60 is movable between a first configuration, in which a flow connection is established between pump 40 and first wheel cylinder 32, in particular by means of first valve device 60, and a second configuration, in which a flow connection is established between pump 40 and the first wheel cylinder 32 is prevented, in particular by means of the first valve device 60 is prevented. In addition, the first valve means 60, especially when the first actuating device 50 is actuated with the first master cylinder 34, can be operated with the first actuating device 50 or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device 60 can be moved or is moved into the first configuration.

In other words, the first valve device 60 is operable, preferably settable and/or adjustable, more preferably actuatable, in order to establish a flow connection between the pump 40 and the first wheel cylinder 32 in a first configuration and a flow connection between the pump in a second configuration 40 and the first wheel cylinder 32 to prevent. The first valve device 60, in particular when the first actuating device 50 is actuated with the first master cylinder 34, can be operated with the first actuating device 50 or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device 60 can be moved or is being moved into the first configuration, in particular from the second configuration into the first configuration.

In this case, for example, the first actuating device 50 can be designed to exert a switching force S on the first valve device 60 . The first actuating device 50 and the first valve device 60 can be configured and operable in such a way that, in particular when the first actuating device 50 is actuated with the first master cylinder 34, the first actuating device 50 actuates the first valve device 60 with the switching force S, so that the first Valve means 60 is movable or being moved into the first configuration. The first valve device 60 can include a first brake valve, in particular be a first brake valve, which can be arranged in the first brake circuit 30 .

The first master cylinder 34 includes a first master cylinder chamber 46 and a first master cylinder piston 44 arranged in the first master cylinder chamber 46.

Here, the first master cylinder port 36 can be an inlet and outlet of the first master cylinder chamber 46 of the first master cylinder 34 . The first master cylinder piston 44 can be brought into a retracted and extended position in the first master cylinder chamber 46 in relation to the first master cylinder chamber 46 by the application of pressure. The first master cylinder 34, in particular the first master cylinder piston 44, can be actuated by the brake pedal 54, in particular the first master cylinder 34 can be actuated by the brake pedal 54 which can be actuated by a user. First brake circuit 30, in particular first wheel cylinder 32, is therefore designed to brake a front and/or rear wheel 14, 16, in particular a front and/or rear driven wheel, in response to actuation of brake pedal 54. In response to an application of the brake pedal 54, the first wheel cylinder 32 can brake the front and/or rear wheel 14,16.

The first master cylinder 34 includes a first reservoir port 70. The first reservoir port 70 is the inlet and outlet for the fluid. A reservoir 72 is also provided. The reservoir 72 can be used as a drain and emergency supply for the first master cylinder 34 and/or a second master cylinder (see figures 6 and 7 , reference numeral 140) may be provided. The first reservoir connection 70 is connected to the reservoir 72 with a first reservoir line 74 . The first master cylinder 34 is thus in fluid communication with the reservoir 72 . The reservoir 72 only has the connection to the first and/or second master cylinder 34, 140, ie it is an independent reservoir. In addition, the reservoir 72 is independent of the steering return and, in particular, is not designed as part of the steering return.

The pump 40 is connected to an accumulator charging device 80 by means of a line 82 . A first brake line 84 of the first brake circuit 30 connects the accumulator charging device 80 to the first valve device 60, in particular the first brake valve. Another first brake line 86 of the first brake circuit 30 connects the first valve device 60 to the first wheel cylinder 32. Between the accumulator charging device 80 and the first valve device 60, a first accumulator 90 is arranged on or in the first brake line 84. The first accumulator 90 is fluidly connected to the first brake line 84 and/or is arranged downstream of the accumulator charging device 80 in the direction of flow. The pump 40 is also fluidly connected to a fluid container 88 and/or is downstream of the fluid container 88 in the direction of flow.

The first actuating device 50 can actuate the first valve device 60 with pressure. As described above, the first actuating device 50 can be designed, for example, as a first pressure valve, as a first pilot valve or as a first auxiliary cylinder.

The first actuating device 50 also includes a first supply connection 100. The first supply connection 100 is the inlet and outlet for the fluid. The pump 40 is connected to the first actuating device 50 by means of a first supply line 102 . The pump 40 is therefore fluidly connected to the first actuating device 50 . In the first supply line 102, as in figure 2 shown, a pressure relief valve 104 may be arranged, which opens should there be a pressure in the first supply line 102 that exceeds a predetermined maximum pressure. A check valve 106 can likewise be arranged in the first supply line 102 between the first supply connection 100 and the pressure relief valve 104 . In order to lower the pressure in the first supply line 102, a throttle 108, in particular a throttle valve, can be arranged between the pump 40 and the pressure relief valve 104.

figure 3 shows a schematic representation of a second exemplary embodiment of the vehicle brake system 28 according to the invention figure 3 vehicle brake system shown essentially corresponds to that in FIGS figures 1 and 2 Vehicle brake system shown, so that only details and / or differences are discussed below.

The vehicle brake system 28 includes a second brake circuit 110. The second brake circuit 110 is provided between the pump 40 and a second wheel cylinder 112, in particular arranged or formed. The pump 40 is operable in the second brake circuit 110 to generate pressure and move fluid within the second brake circuit 110 .

In figure 3 the second brake circuit 110 is coupled to one or more front wheels 14, in particular by means of the second wheel cylinder 112. However, the second brake circuit 110 can also be coupled to only one rear wheel or to a plurality of rear wheels 16 . In particular, the first brake circuit 30 can be coupled to the rear wheels 16 and the second brake circuit 110 can be coupled to the front wheels 14 . Likewise, the first brake circuit 30 can also be coupled to a rear or front wheel 14, 16 and the second brake circuit 110 to another rear or front wheel 14, 16. Another second brake line 114 of the second brake circuit 110 connects the first valve device 60 to the second wheel cylinder 112. The first and/or second brake circuit 30, 110 can be physically provided in a hydraulic unit 116.

The first valve device 60, in particular the first brake valve, is provided, in particular arranged, in the first and second brake circuit 30, 110. The first valve device 60 is movable between a first configuration, in which a flow connection is established between the pump 40 and the first and second wheel cylinders 32, 112, in particular by means of the first valve device 60, and a second configuration, in which a flow connection is established between of the pump 40 and the first and second wheel cylinders 32, 112 is prevented, in particular by means of the first valve device 60.

The first valve device 60 can be operated, particularly when the first actuating device 50 is actuated with the first master cylinder 34, with the first actuating device 50 or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the first valve device 60 in the first configuration is movable or being moved. Second brake circuit 110, in particular second wheel cylinder 112, is designed to brake a front and/or rear wheel 14,16, in particular a front and/or rear driven wheel 14,16, in response to actuation of brake pedal 54. In response to an actuation of the brake pedal 54, the second wheel cylinder 112 can therefore brake the front and/or rear wheel 14, 16.

figure 4 shows a schematic representation of a third exemplary embodiment of the vehicle brake system 28 according to the invention figure 4 Vehicle brake system 28 shown corresponds essentially to that in FIGS Figures 1 to 3 shown vehicle brake system 28, so that only details and / or differences are discussed below.

The vehicle brake system 28 includes according to figure 4 a second valve device 120. The second valve device 120 can in particular be arranged between the pump 40 and the second wheel cylinder 112, as shown. Second valve device 120 is provided, in particular arranged, in second brake circuit 110 . The second valve device 120 is movable between a third configuration, in which a flow connection is established between the pump 40, or in particular the second pump, and the second wheel cylinder 112, in particular by means of the second valve device 120, and a fourth configuration, in which prevents a flow connection between pump 40 and second wheel cylinder 112, in particular by means of second valve device 120. The first and second valve means 60, 120, in particular when the first actuating device 50 is actuated with the first master cylinder 34, are with of the first actuating device 50 or operable in such a way, preferably adjustable and/or adjustable, particularly preferably operable or operable in such a way that the first valve device 60 can be moved or is moved into the first configuration and the second valve device 120 into the third configuration, in particular from the fourth configuration is movable or being moved into the third configuration.

In this case, for example, the first actuating device 50 can be designed to exert a switching force S on the first and second valve device 60 , 120 . The first actuating device 50 and the first and second valve devices 60, 120 can be configured and operable in such a way that, in particular when the first actuating device 50 is actuated with the first master cylinder 34, the first actuating device 50 actuates the first and second valve devices 60, 120 with of the switching force S, so that the first valve device 60 can be moved into the first configuration and the second valve device 120 can be moved into the third configuration.

However, the first actuating device 50 can also actuate the first and second valve devices 60, 120 with pressure. When the first actuation port 52 is pressurized by the first master cylinder 34, the first actuation device 50 moves the first valve device 60 to the first configuration and the second valve device 120 to the third configuration. In particular, when the first actuation port 52 is pressurized by the first master cylinder 34, the first slave cylinder, in particular the first slave cylinder piston, can move the first valve device 60 to the first configuration and the second valve device 120 to the third configuration.

In addition, a second brake line 118 of the second brake circuit 110 connects the accumulator charging device 80 to the second valve device 120, in particular the second brake valve. Another second brake line 118 of the second Brake circuit 110 connects the second valve device 120 to the second wheel cylinder 112. Between the accumulator charging device 80 and the second valve device 120, a second accumulator 122 is arranged on or in the second brake line 118. The second reservoir 122 is in flow connection or flow-connected to the second valve device 120 and the reservoir charging device 80 by means of the second brake line and/or is arranged downstream of the reservoir charging device in the direction of flow.

figure 5 shows a schematic representation of a fourth exemplary embodiment of the vehicle brake system 28 according to the invention figure 5 Vehicle brake system 28 shown corresponds essentially to that in FIGS Figures 1 to 4 shown vehicle brake system 28, so that only details and / or differences are discussed below.

As in figure 5 shown, the vehicle brake system 28 comprises a second actuating device 130 with a second actuating connection 132. The first master cylinder connection 36 is in fluid communication with the second actuating connection 132. In addition, the second actuating device 130 can be operated with the first master cylinder 34 or is operated with this, preferably adjustable and/or adjustable, particularly preferably operable. In addition, in particular when the first and second actuating device 50, 130 are actuated with the first master cylinder 34, the first valve device 60 can be operated with the first actuating device 50 and the second valve device 120 with the second actuating device 130 or can be operated in this way, preferably adjustable and/or or adjustable, particularly preferably operable or operable in such a way that the first valve device 60 can be moved or can be moved into the first configuration and the second valve device 120 into the third configuration.

The first master cylinder port 36 and the second actuation port 132 are each inlet and outlet for the flowing fluid, in particular the hydraulic fluid. The vehicle brake system 28 includes a second actuation line 134. The first master cylinder port 36 is therefore connected to the second actuation port 132 by means of the second actuation line 134. The first master cylinder 34 is therefore in fluid communication with the second actuating device 130 and the first master cylinder 34 is with the second actuator 130 fluidly connected. In the present exemplary embodiment, the first master cylinder port 36 is connected to the first and second actuating port 52, 132. In this case, for example, the second actuating device 130 can be designed to exert a switching force S on the second valve device 120 . The second actuating device 130 can include, for example, a second pressure valve, specifically a piston, with the second actuating connection, or be designed as the described pilot valve or second auxiliary cylinder.

The second actuating device 130 also includes a second supply connection 136. The second supply connection 136 is the inlet and outlet for the fluid. The pump 40 is connected to the second actuating device 120 by means of a second supply line 138 . The pump 40 is therefore fluidly connected to the second actuating device 120 . The first and second supply lines 102, 138 partially run as a common line, with the pressure relief valve 104, the check valve 106 and the throttle 108 being arranged in the common line. However, the first and second supply lines 102, 138 can also be designed as completely separate lines. A further pressure relief valve 104 can then be arranged in the second supply line 138, which valve opens if the pressure in the second supply line 138 exceeds a predetermined maximum pressure. A further check valve can likewise be arranged in the second supply line 102 between the second supply connection 136 and the further pressure relief valve. To the pressure in the second supply line 138 to reduce and / or limit, between the pump 40 and the additional pressure relief valve, a further throttle, in particular a throttle valve can be arranged.

figure 6 shows a schematic representation of a fifth exemplary embodiment of the vehicle brake system 28 according to the invention figure 6 Vehicle brake system 28 shown corresponds essentially to that in FIGS Figures 1 to 5 shown vehicle brake system 28, so that only details and / or differences are discussed below.

As in figure 6 shown, the vehicle brake system 28 includes a second master cylinder 140 with a second master cylinder port 142. The second master cylinder port 142 and the second actuation port 132 are respectively inlet and outlet for the fluid. The first master cylinder port 36 is therefore connected to the first actuating port 52 by means of the first actuating line 38, and the second master cylinder port 142 is connected to the second actuating port 132 by means of the second actuating line 134. The second master cylinder 140 is therefore in fluid communication with the second actuating device 130 or The second master cylinder 140 is fluidly connected to the second actuator 130 . In addition, second actuating device 130 can be operated with second master cylinder 140 or is operated with it, preferably adjustable and/or adjustable, particularly preferably operable. In addition, the second valve device 120, in particular when the second actuating device 130 is actuated with the second master cylinder 140, can be operated with the second actuating device 130 or can be operated, preferably adjustable and/or adjustable, particularly preferably actuated or can be actuated in such a way that the second valve device 120 is moveable or being moved to the third configuration.

The second master cylinder 140 includes a second master cylinder chamber 146 and a second master cylinder piston 144 arranged in the second master cylinder chamber 146 . The second master cylinder port 142 can be an inlet and outlet of the second master cylinder chamber 146 . The second master cylinder piston 144 can be brought into a retracted and extended position in the second master cylinder chamber 146 by the application of pressure. The second master cylinder 140, in particular the second master cylinder piston 144, can be actuated with a further brake pedal 150, in particular the second master cylinder 140 can be actuated by the further brake pedal 150 which can be actuated by a user. The second master cylinder 140 includes a second reservoir port 152. The second reservoir port 152 is the inlet and outlet for the fluid. The second reservoir port 152 is connected to the reservoir 72 with a second reservoir line 154 . The second master cylinder 140 is thus in fluid communication with the reservoir 72 .

It is therefore essential for this exemplary embodiment that the first valve device , in particular when the first actuating device 130 is actuated with the first master cylinder 140, can be operated with the first actuating device 130, that the first valve device 120 can be moved into the first configuration and/or the second Valve device 120, in particular when the second actuating device 130 is actuated with the second master cylinder 140, can be operated with the second actuating device 130 such that the second valve device 120 can be moved into the third configuration. The vehicle brake system 28 is thus configured, in response to an actuation of the brake pedal 54 and/or the further brake pedal 150, to brake the front and/or rear wheels 14, 16 assigned to the respective first and second wheel cylinders 32, 112 independently of one another. The brake pedal 54 and the further brake pedal 150 can be actuated independently of one another, but together or individually.

figure 7 shows a schematic representation of a sixth embodiment of the inventive vehicle brake system 28. The in figure 7 Vehicle brake system 28 shown corresponds essentially to that in FIGS Figures 1 to 6 shown vehicle brake system 28, so that only details and / or differences are discussed below.

The first and second master cylinders 34, 140, in particular the first and second master cylinder pistons 44, 144, can only be actuated together with the brake pedal 54 in this exemplary embodiment. The vehicle brake system 28 is thus designed, in response to an actuation of the brake pedal 54, to brake the front and/or rear wheels 14, 16 associated with the respective first and second wheel cylinders 32, 112 at the same time. The first and second brake circuits 30, 110, in particular the first and second wheel cylinders 32, 112, can therefore, in response to an actuation of the brake pedal 54, jointly move the front and/or rear wheels 14, 16 assigned to the first and second wheel cylinders 32, 112 brake.

Each inventive agricultural towing vehicle 10, in particular according to figure 1 , All exemplary embodiments of a vehicle brake system 28 according to the invention, in particular according to FIG Figures 1 to 7 include. The first and/or second master cylinder 34, 140 and the reservoir 72 are arranged in the cab 20 and all other components of the vehicle brake system 28 in all other parts of the towing vehicle, in particular on or in the chassis.

figure 8 shows a schematic representation of an arrangement of a vehicle brake system 28 according to the invention in a towing vehicle 10 according to the invention figure 8 Vehicle brake system 28 shown corresponds essentially to that in FIGS Figures 1 to 7 vehicle brake system 28 and towing vehicle 10 shown, so that only details and/or differences will be discussed below. Only the first and/or second master cylinder and the reservoir, and in particular the associated lines, are arranged in the cabin 20 .

All other components of the vehicle brake system are on, in particular in, the chassis.

figure 9 shows a schematic representation of the first or second actuating device with the respective associated valve device 60. The in figure 9 The details of the vehicle brake system 28 shown essentially correspond to those in FIGS Figures 1 to 8 shown vehicle brake system 28 or the towing vehicle 10, so that only details and / or differences are discussed below.

The first and/or the second valve device 60, 120 can each have a first restoring element 180 for restoring into the second or fourth configuration. In addition, the first and/or the second valve device 60, 120 can each have a second restoring element 182 for restoring into the second and/or fourth configuration. Advantageously, the fluid flow is interrupted when the brake pedal 54 and/or the further brake pedal 150 is lightly actuated, with each further movement building up pressure and the first and/or second valve device 60, 120 being actuated.

Claims (15)

Vehicle brake system, comprising: a first master cylinder (34) having a first master cylinder port (36), a first actuator (50) having a first actuator port (52), the first master cylinder port (36) being in fluid communication with the first actuator port (52), and the first actuator (50) can be operated with the first master cylinder (34), a first brake circuit (30) provided between a pump and a first wheel cylinder, the pump being operable in the first brake circuit (30) to generate pressure and move a fluid within the first brake circuit (30), characterized in that A first valve device (60) is provided in the first brake circuit (30), the first valve device (60) being arranged between a first configuration, in which a flow connection is established between the pump (40) and the first wheel cylinder (32), and a second configuration in which fluid communication between the pump (40) and the first wheel cylinder (32) is prevented, and the first valve means (60) is operable with the first actuating means (50) such that the first valve means (60) is movable in the first configuration is movable. Vehicle brake system according to Claim 1, characterized in that the vehicle brake system (28) comprises a second brake circuit (110) which is provided between the pump (40) and a second wheel cylinder (112), the pump (40) being in the second brake circuit (110 ) is operable to print generate and to move the fluid within the second brake circuit (110). Vehicle brake system according to Claim 2, characterized in that the first valve device (60) is provided in the first and second brake circuit (30, 110), the first valve device (60) being between a first configuration in which a flow connection between the pump (40) and the first and second wheel cylinders (32, 112) and is movable to a second configuration in which fluid communication between the pump (40) and the first and second wheel cylinders (32, 112) is prevented, and the first valve means ( 60) can be operated with the first actuating device (50) such that the first valve device (60) can be moved into the first configuration. Vehicle brake system according to Claim 2, characterized in that a second valve device (120) is provided in the second brake circuit (110), the second valve device (120) being between a third configuration in which a flow connection between the pump (40) and the second wheel cylinder ( 112) and is movable to a fourth configuration in which fluid communication between the pump (40) and the second wheel cylinder (112) is prevented. Vehicle brake system according to Claim 4, characterized in that the first and second valve device (60, 120) can be operated with the first actuating device (50), that the first valve device (60) can be switched to the first configuration and the second valve device (120) can be switched to the third Configuration is movable. Vehicle brake system according to Claim 4, characterized in that the vehicle brake system (28) comprises a second actuating device (130) with a second actuating connection (132), the first The master cylinder port (36) is in flow communication with the second actuating port (132), and the second actuating device (130) is operable with the first master cylinder (34), the first valve device (60) being operable with the first actuating device (50) and the second valve device (120) can be operated with the second actuating device (130), that the first valve device (60) can be moved into the first configuration and the second valve device (120) can be moved into the third configuration. Vehicle brake system according to Claim 4, characterized in that the vehicle brake system (28) comprises a second master cylinder (140) with a second master cylinder connection (142) and a second actuating device (130) with a second actuating connection (132), the second master cylinder connection (142) is in fluid communication with the second actuating port (132), and the second actuating device (130) is operable with the second master cylinder (140), and the first valve device (60) is operable with the first actuating device (50), that the first valve device ( 60) is movable into the first configuration and/or the second valve device (120) is operable with the second actuating device (130), that the second valve device (120) is movable or is moved into the third configuration. Vehicle brake system according to at least one of the preceding claims, characterized in that the first actuating device (50) has a first supply connection (100) and/or the second actuating device (130) has a second supply connection (136). Vehicle brake system according to at least one of the preceding claims, characterized in that the first and/or second supply connection (100, 136) are flow-connected to the pump (40) by means of a first supply line (102). Vehicle brake system according to at least one of the preceding claims, characterized in that the first master cylinder (34) comprises a first reservoir connection (70) and/or the second master cylinder (140) comprises a second reservoir connection (152) and/or the first master cylinder (34) by means of of the first reservoir connection (70) and/or the second master cylinder (140) is flow-connected to a reservoir (72) by means of the second reservoir connection (152). Vehicle brake system according to at least one of the preceding claims, characterized in that the first and/or the second valve device (60, 120) each have a first restoring element (180) for restoring into the second and/or fourth configuration. Vehicle brake system according to at least one of the preceding claims, characterized in that the first and/or the second valve device (60, 120) each have a second restoring element (182) for restoring into the second and/or fourth configuration. Agricultural towing vehicle comprising a vehicle brake system (28) according to any one of claims 1 to 12. Agricultural towing vehicle according to Claim 13, characterized in that the towing vehicle (10) comprises a cab (20) and a chassis, the cab (20) being arranged on the chassis. Agricultural towing vehicle according to Claim 14, characterized in that the first and/or second master cylinder (34, 140) and the reservoir (72) are arranged in the cab (20).

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